MEP-54 note 07: Go target and portability

Author: research pass for MEP-54 (Mochi to Go transpiler). Date: 2026-05-29 (GMT+7).

GOOS/GOARCH matrix (linux/amd64, linux/arm64, darwin/amd64, darwin/arm64, windows/amd64), CGo cross-compile with zig cc, GOOS=wasip1 GOARCH=wasm under wasmtime, static linking with CGO_ENABLED=0 for non-CGo builds.

Full research note content for MEP-54 note 07.